AVS Special Member
Join Date: Dec 2005
Location: South Central Indiana
Mentioned: 1 Post(s)
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Let me see if I can help you with the confusion. You basically now have two displays (TV and PJ), a couple of sources (DVD, PS3,) and a sound bar.
Typically in most cases you would have your source, DVD player, connected to the TV via HDMI, and then optical from the TV to the soundbar, or HDMI from the DVD player to the TV and optical from the DVD player to the soundbar. If you don't have some type of AV receiver/switcher then you will have to swap HDMI cables from the display you want to the source you want. So it might be better if you get a AV receiver that can do the switching for you or go to monoprice and get an HDMI switcher so you don't have to swap cables all the time.
To answer your question, you will need an audio cable (optical or digital coax if so equiped) and a video cable (HDMI, component, composite, Svideo) to carry video signals.
Without knowing exactly what you have this is the best advise I can give you at the moment.